Improvement in screw-propellers



A. De BEAUMONT.

SC-REW-PROPELLER. No.188,10.6-, Patented March 6,1877.

N PETERS. PHOTOLIYHOGRAPNEH. WASHINGTON U C UNITED STATES ALEXANDRE DEBEAUMONT, OF PHILADELPHIA, PA., ASSIGNOR OF ONE- PATENT Orrxca HALF HISRIGHT TO WILHELM ROTHE, OF BERNBURG, GERMANY.

IMPROVEMENT IN SCREW-PROPELLERS.

Specification forming part of Letters Patent No. 188,106, dated March 6,1877 application filed January 8, 1877.

To all whom it may concern Be it known that I, ALEXANDRE DE BEAU- MONT,of Philadelphia, Pennsylvania, have invented a new and usefulImprovement in Screw-Propellers, of which the following is aspecification My invention relates to an improvement in sorewpropellerswith reversible blades, the object ofmy invention being to so constructa propeller of this class that it will be strong and not liable to getout of order.

In the accompanying drawing, Figure 1 is a section through the hub,shaft, and blades of the propeller; and Figs. 2 and 3, sections on theline 1 2, Fig. 1, illustrating the manner of altering the position ofthe blades.

The rear portion of the propeller-shaft A is made hollow for thereception and guidance of the rod B, on which is a rack, a, the teeth ofthe latter gearing into teeth on a shaft, D, which passes through andhas its bearings in the shaft B, where the latter is externallyenlarged, as shown in Fig. 1. The opening h in the hub H of thepropeller is elongated in one direction, as shown in Fig. 4., and to thehub are secured the opposite ends of the shaft D, as seen in Fig. l.

The propeller should be divided at the hub on the line as, Fig. 4, andthe two parts bolted together, as there shown, the opposite sides of theenlargement on the shaft being made flat for the opposite sides of theopening in the hub to bear against, so as to steady the propeller on theshaft. 7

The end of the tubular shaft should be continued through and have itsbearings in the stern post of the vessel, on the outside of which therod B is to be connected to any appropriate appliances whereby it can bereadily moved to and fro in the shaft, and the blades caused to assumeeither of the positions shown in Figs. 2 or 3, or to any intermediateposition, by the operation of the rack a of the rod B on the teeth ofthe shaft D.

It will be seen that when the blades have been moved to one extremeposition the propeller will serve to move the vessel ahead, and when inthe other extreme position to back the vessel, and that the bladesbecome eflective steering mediums by adjusting them to intermediatepositions.

Very little effort will be required to adjust the propeller in steeringthe vessel, for the strain exerted on one blade is counteracted by anopposing strain on the other blade.

I am aware that propellers have been heretofore made with bladesseparate from the hub, and attached to the ends of a shaft similar tothe shaft D; but these are objectionable on account of their weaknessand liability to get out of order-objections which I overcome by makingboth hub and blades a unit in efl'ect, and turning the whole structure.

1 claim as my invention The combination of the hub H of a propeller,having two blades and a recess, h, with the tubular portion of the shaftA, the pivotpin D, the rod B, adapted to the shaft A, and mechanism,substantially as described, whereby the movement of the rod iscommunicated to the propeller, as herein described.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

ALEXANDRE DE BEAUMONT.

Witnesses:

HERMANN MOESSNER, HARRY SMITH.

